PR and reputation blog written by Jonathan Welsh, an award-winning PR expert based in Manchester and working nationally and internationally. Former MP's assistant, senior director at a global PR firm, and married father of two.

What is shows is that with a Mayoral election on the horizon, Boris is prepared to put the coalition's neck on the line ahead of his own. The summer soldier is ready to turn his rifle on his own party.

This is before the full effect of any cuts have become apparent.

I am confident this public use of such strong (and completely unnecessary) language will damage the coalition because it sets a precedent.

Long into the night, when the winter of discontent has left its bite on the country, Lib Dem and Tory MPs will face the same decision as the Mayor.

Do we stick to the coalition line or do we play to the crowd, to try and battle Labour on the anti-coalition vote?

They may well take a glance at Boris, daring to march against the agreed line and see if he still holds power in the Capital.

If he does, then temptation will take hold.

It's not just a gaffe, Boris, it's a damaging blow to the coalition's internal and external reputation.